Abstract: Maize straw crushing and returning to field is an application technology of agricultural mechanization that uses straw pulverizer to pulverize straw of corn picker，throw in the ground，plough and decompose，so that the soil is fertile.Efficiency was improved，labour intensity was reduced，time availability was advanced after using this technology.Much organic matter and nutritional content of maize straw such as Nitrogen，Phosphorus，Kalium，Magnesium，Calcium and Sulfur could improve soil structure and physicochemical properties，increase content of organic matter and promote sustainable yield of crops.